The word that indicates bias in the sentence “sloppy play sends tigers to final loss” is sloppy.
Sloppy means careless and unsystematic; excessively casual. And maybe other journalist wouldn't have used this term.
Media bias refers to the bias of journalists as well as news producers within the mass media when they select events and stories to be reported and how they are covered.
The most commonly discussed types of bias take place when the (allegedly partisan) media support or attack a especific political party, candidate, or even ideology.